I have to read this again, but I don't see any mention of Meade having sent Hancock to Gettysburg on Day One to take command. Reynolds came up at Buford's request, but Meade sent Hancock to find out if Gettysburg was good ground to fight on. I think we have to remember that Meade only had the army for a grand total of two days leading up to Gettysburg and that the AOP took a hell of a beating itself. A counterattack could well have led to another Fredericksburg. Lee was on a ridge himself, and the ground in between them would have been as unforgiving for Union troops as it was for the Confederates. He should, however, have given serious thought to hitting Lee when his supply trains and infantry columns were stretched out on the way back to Virginia. As far as Sickles, he was an unapologetic opportunistic Tammany Hall huckster who couldn't be trusted as far as he could be thrown. That anyone bought into his nonsense is a head scratcher.